Re: [Leica] OT Flash guide numbers and they work? OT

[Henry Ting <henryting10@yahoo.com>]

From your experience, can you tell us more on the high
speed sync with the M7 and 54MZ3 combo ?
I like to understand more of this feature, pros and
cons etc.

- --- "J. Gilbert Plantinga" <gilplant@hvc.rr.com>
wrote:
> I don't know how to explain it simply, but I do know
> the formula:
> Aperture = Guide Number / Distance
> 
> I also know that the most useful fact is that the
> guide number for iso 
> 100 is usually the model number of the flash, and
> the bigger that number 
> is the more powerful, and more expensive (and for me
> more likely to give 
> that blown-out look) the flash is.
> 
> I had to check the instructions on the SF 20, but an
> example of the 
> formula in use is:
> 
> f2 = guide number 20 / 10 meters
> 
> so with 100 speed film the SF 20 has a range of 10
> meters at f2, but 
> only 5 meters at f4 etc. The really nice thing is
> that the SF 20 will do 
> all the calculations for me and display the results
> (on the LCD, not 
> unfortunately the picture! Available light still
> rules!).
> 
> On my bigger Metz 54 MZ3 the guide number is
> effectively different when 
> the reflector is zoomed to cover diverent focal
> lengths. Makes my head 
> spin. But this Metz is also pretty simple for a
> dufus like myself to 
> operate, and I've even checked out the high speed
> sync with it on the M7 
> (it works).
> 
> Gilbert
> 
> On Friday, July 12, 2002, at 06:23  PM, Ted Grant
> wrote:
> 
> > Hi folks,
> >
> > This is right off the wall ancient need to learn
> it over again.
> >
> > A chap down the street called and asked me how to
> use the guide number 
> > on
> > the flash he has?
> >
> > Well OK I thought I knew.... however that was 45
> years ago when the 
> > flash of
> > the day had guide numbers. Even then I had trouble
> figuring that stuff 
> > out,
> > then I discovered photo life was much easier when
> you didn't use flash 
> > and
> > go available light. ;-)
> >
> > Besides any flash I used over the years has always
> been something 
> > automatic
> > no brainer thing.  So please help me with a very
> simple way to explain 
> > this
> > guide number and how to make it work with whatever
> flash and camera is 
> > he
> > has.
> >
> > thanks guys and gals.
> > ted
> 
> --
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